Air gun and the method of making it



My 23, 1929. R. MCFARLAN 1' 1,722,103 AIR GUN AND THE. METHOD OF MAKING IT Filed June 1924 //\/l NT@/9 RANDALL M FAQLAN ATTQQN E 2 1 Patented July 23, 1929.

UNITED STATES PATENT OFFICE.-

RANDALL MCFARLAN, F CINCINNATI, OHIO, ASSIGNOR TO THE WM. POWELL CQ., CINCINNATI, OHIO, A CORPORATION OF OHIO.

All}. GUN AND THE METHOD OF MAKING IT.

Application filed June 11,

u as to avoid disarrangement thereof by inexpcrienccd operators; to provide a press button adapted when manually operated to open the airpassage through said gun and having a shank attached thereto adapted to automatically close said air passage, when pressure is released from said button, caused by the pressure of the air within the air gun and irrespective of the aid of resilient means; to provide an air gunadapted, when laid down, to automatically take a position relative to said press button, whereby said press button is adapted to disengage contact with the surface upon which the gun rests, thereby permitting the valve within the gun to have frcedonrto automatically close the air passage; andto provide an air gun having an arrangement and combination of parts adapted to enable'said gun to be produced at a low cost. of manufacture.

My invention consists in providing a body portion having two flat sides oppositely disposed and extending in parallel relation to the valve stem, said body having a transverse hole therethrough in parallel relation with said flat sides and having a longitudinal hole leading from the nozzle to said transverse hole, and having a hole leading from the air supply connection socket diagonally to said transverse hole whereby an air passage is formed through said gun by way of said diagonal transverse and longitudinal holes; in providing a valve stem or shank having a reduced section and slidably-mounted within said transverse hole and a press button fixed to the outer end of said shank as by a burnishing or peening process; in providing said press button with means adapted to prevent escape of air from said gun when said-button is pressed inwardly; in providing said transverse hole with an enlarged cylindrical chamberand a valve seat formed adjacent the, inner end of said chamber; in providing a valve on 1924. Serial No. 719,438.

seat in said valve seat for cutting off the flow of air throughsaid gun; in providing a part of said chamber with internal threads adapted to receive an externally threaded plug; and in providing said body with m ansadapted to protect said press button against accidental inward pressure. when said body is laid down.

My invention also consists in the combination and arrangement of parts and in the details of construction as herein set forth and claimed.

In the drawings: Fi 1 is a side elevation of my invention; Fig. 2 is a front end View; Fig. 3 is a section corresponding to 33 in Fig. 5;

Fig. sponding to l4 of Fig. ,3;

Fig. '5 is a. plan View; Fig. (i is a bottom View; Fig.

l is a section taken on a line correl is a section of my press button;

Fig. 8 is a side elevation of the valve and valve stem or shank;

Fig. 9 is a perspective view showing my in- -vention in modified form having an' out- The edge of shoulder 7 formed by transverse hole 2 leading into enlarged transverse chamber 3 is beveled at 8 thereby forming a seat for tapered valve 9. Valve 9 is integral with valve stem or shank 11 having enlarged cylindrical section 12 and slidably mounted in transverse hole 2. Shank 11 has press button 18 fixed to its outer end 14 by any suitable means, preferably consisting in providing the press button with a centrally disposed hole 15 having flared sides 16 at itsouter end and adapted to receive end 14 of shank 11, having longitudinal reeess1 7 therein thereby permitting the metal shell of the shank adjacent re-' cess 17 to be flared outwardly in engagement with flared sides 16 of press button 13 by a usual burnishing process whereby the press The inner portion 18 of press button 13 is beveled and titted in valve seat 1!) of body 1 for the purpose of preventing escape of air through the outer end of transverse hole 2, when the air gun is in operation.

The inner end 20 of body 1 has threaded socket 21 therein and extending longitudinally thereof for forming connecting n'ieans with the external threaded end of the usual air supply pipe or hose. Cylindrical hole 22 leads diagonally from socket 2t to chamber 5- and may be conveniently drilled by inserting the drill in socket 21.

Longitudinal cylindrical. hole 23 leads from transverse hole 2 :uljacent reduced portion 24 of shank 11 to internally threaded hole 25 in theouter end 26 of body 1. Suitably formed nozzle 27 has integral end 28 threaded in hole 25 o t. body 1 and has air outlet. 29 leading from longitudinal hole. 23 to nose 30 ot' the nozzle. In Fl 's. 9 and 10 I show a modified form of my invention having outwardly extending transversely curved flange 32 adjacent the front of press button '13. The flange is for the purpose of preventing accidental pressure of the press button when the air gun 1S laid 1 down, and is slightly curved, transversely, to contour] to the shape of the end of a thumb usually employed to exert inward pressure on the press-button.

As shown in Fig. 3, I providethe inner end of valve stem 11 with a screwdriver slot in order that when screw plug 5 is removed a screwdriver may be inserted whereby the valve stem 11 may be rotated for the purpose of grinding the tapered valve 9 and its adjacent seat.

The operation of the mechanism of my detransverse hole 2, longitudinal hole 23, and' through nozzle outlet 29, manually operated press button 13 is pressed inwardly, thereby disengaging inclined sides lOof valve 9 from valve seat 8 whereby compressed air is permitted to flow from chamber 3 and through nozzle outlet 29 by way of transverse hole 2 and longitudinal hole 23. Enlarged part 12 of shank 11 is fitted in transverse hole 2 and inclined surface 18 of press button 13 fits in valve seat or countersink 19, tliereby preventing escape of air from the gun through the outer end or "transverse hole 2 adjacent the press button. r

Thus it is seen that I have invented an exceedingly simple, effective and eflicient air gun having a two piece valve stem adapted to automatically close when hand pressure 1s*re leased from press button 11, (forming one part of the stem) and having no complicated parts adapted to get out of order.

Great economy is effected by my constrnc tion both by way of materially reducing the cost of repairs and upkeep in comparison to usual air guns employing springs-or other complicated valve mechanisms. I also provide a body portion 1 adapted to be moldedby a usual metal casting process, then drilling and threading holes 3, 21 and 23, and drilling transverse holes-2 and diagonal. hole 22, and beveling valve seats 8 and '19 which completes the mechanical work required to produce the finished body. Other parts'such as press button 13, valve shank 11, screw 5 and nozzle 27' WVhile I have shown and described a particular construction of mechanism it w ill be understood that it may be varied in construction and arrangement without departing from the scope or spirit thereof, as defined in the claims, as for instance, the flange or projeetion 32-mayextend either partly or en-' tirely around and above the press button.

What I claim as new and desire to secure by Letters Patent is:

In a self-closing blow gun, a body having a drilled transverse hole .part way therethrough, a countersink at the outer end thereof, an enlarged chamber extending from the inner end of said hole to the outer part ot'said body and in alinement with said hole and having internal screw threads therein, a screw plug in theouter end of said chamber having a recess therein, a solid valve stem slidablv mounted in said hole and having a reduced intermediate section to permit the free passage of air therearound within said transverse hole, a press button fixed to the, outer end of said valve stem, means for sealing the outer'end otthe transverse hole to prevent; leakage of air around the valve stem when the valve is open, a tapered valve seat formed at the junction of said hole andsaid chamber,

and a tapered valve on the inner end of said valve stein adapted to seat on said tapered valve seat. I I

RANDALL McFARLAN. 

